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Heil sp80 gas furnace - burners won't stay lit

10+ year old furnace. system turned on, had to relight the burners, ran for a few minutes, burners keep going out, but system keeps running.

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  • sbradley29 Dec 25, 2008

    Christmas eve mine also started acting up. When thermostat signals to come on and the air purge (I guess) starts, the electric ignitor will not start glowing, or if it does it only stayed lit for a few seconds long enough for the gas to kick on (5 at the most) and then unit flames out. Is it the thermacoupler or what?

  • Ken Bledsoe May 11, 2010

    Does the system run for 30 seconds or like you said 4 or 5 minutes?

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2 Suggested Answers

JetJedi221
  • 25 Answers

SOURCE: The furnace burners won't stay lit

Could be a couple things. First and easiest is to check your intake combustion air supply. If it is blocked by anything or just not enough flow, it will put out the flame. Next would be the flame sensor, usually a temperature probe near the flame front. If it's not reading an increase in temp within a pre-programmed time, it will kill the flame. It can be checked with a multimeter.

Good luck!

Posted on Jan 25, 2008

SOURCE: Furnace burners wait too long to come on

Sounds like the burners need to be removed from the furnace and cleaned thoroughlyto help with gas distribution if these are in-shot burners they look sort of like an air plane, they have a cross over tube on each side of each burner and if that is rusted up the gas will not distribute evenly from one burner to the next if the pilot and burners go off at the same time then it sounds like you may have some flame blow back maybe due to soot build up in the heat exchanger. Overall sounds like your furnace could use a good servicing

Posted on Oct 16, 2007

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